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gpiolib: of: improve gpiolib-of support of pull up/down on expanders

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When using GPIO expanders attached to I2C ports, their set_config function
needs to be passed a config setting which contains options to enable pull
up or pull down bias feature.  In order to set this config properly,
the gpio parser needs to handle GPIO_PULL_UP and GPIO_PULL_DOWN.

This patch enables the flags corresponding to GPIO_PULL_UP and
GPIO_PULL_DOWN.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Adam Ford 2020-04-11 20:33:51 -05:00 committed by Bartosz Golaszewski
parent 616844408d
commit ea06a482a4
1 changed files with 10 additions and 0 deletions
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10
drivers/gpio/gpiolib-of.c
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@ -344,6 +344,12 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
if (transitory)
lflags |= GPIO_TRANSITORY;
if (flags & OF_GPIO_PULL_UP)
lflags |= GPIO_PULL_UP;
if (flags & OF_GPIO_PULL_DOWN)
lflags |= GPIO_PULL_DOWN;
ret = gpiod_configure_flags(desc, propname, lflags, dflags);
if (ret < 0) {
gpiod_put(desc);
@ -585,6 +591,10 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
*lflags |= GPIO_ACTIVE_LOW;
if (xlate_flags & OF_GPIO_TRANSITORY)
*lflags |= GPIO_TRANSITORY;
if (xlate_flags & OF_GPIO_PULL_UP)
*lflags |= GPIO_PULL_UP;
if (xlate_flags & OF_GPIO_PULL_DOWN)
*lflags |= GPIO_PULL_DOWN;
if (of_property_read_bool(np, "input"))
*dflags |= GPIOD_IN;